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It’s no secret that too many adults around the world are overweight. But when 20 million children under the age of 5 are considered too fat, researchers worry about the risk of chronic illness as these kids grow older. Now research of at least 3,600 children in North America shows that poor eating habits and lack of exercise are producing risk factors for heart disease, including high cholesterol and diabetes. To make matters worse, tests on some of these kids indicated narrowing and hardening of the arteries. That is a condition normally associated with adults.